本文提出了一种基于光谱积分宽度法来测量发光二极管 (light emitting diode,LED)结温的新方法,并进行了理论分析和实验研究。本方法主要分为光谱数据采集、定标函数的测定和结温测量三个过程。首先,为了测量成本的降低和精度的提高而采用在正常工作电流下采集LED光谱数据,并通过采用不同温度下的光谱积分宽度与选定的某一基准状态下的值逐差可得到线性度达0.99以上的定标函数,并通过此定标函数可实时测定任意状态下的结温。其次,为了比较本方法测量结温的精确性,分别对单色和白光LED采用本方法和业界主流的正向电压法,通过自行设计的基于积分宽度法结温测量系统和美国Mentor Graphics公司的T3Ster型仪器的测量结果进行比较,两种方法测出的结温最大偏差为2.1 ℃,在可接受的误差范围内。实验结果表明积分宽度法测结温具有高效便捷且低成本的的特点,具有一定的应用前景。

This paper proposes a new method measuring LED junction temperature based on spectral integral width method,and conducts theoretical analysis and experiment research.This method is mainly divided into three processes:spectral data acquisition,calibration function measurement and junction temperature measurement. First,in order to reduce the measurement cost and improve the accuracy,LED spectral data are collected under normal working current,and a calibration function with a linearity of more than 0.99 can be obtained by using the spectral integration width at different temperatures and the value of a selected reference state,and the junction temperature under any state can be measured in real time through this calibration function.Second,in order to compare the accuracy of this method for measuring junction temperature,this method and the industry mainstream forward voltage method are used for monochrome and white LED respectively.The measurement results of the self-designed junction temperature measurement system based on integral width method and the T3Ster instrument of Mentor Graphics Company in the United States are compared.The maximum deviation of junction temperature measured by the two methods is 2.1 ℃,which is within the acceptable error range.The experimental results show that the integral width method has the characteristics of high efficiency,convenience and low cost,and has a certain application prospect.

国家自然科学基金(61974094)、广东省重点领域重大研发计划(2020B010169003)和深圳大学实验室与设备管理研究基 金(2021008)资助项目